A security service that prevents exposure of application data to unauthorized parties while the data is in flight.
data integrity
A security service that detects modifications made to data while in flight. Data integrity can be implemented as connectionless or connection-oriented.
data origin authentication
A security service that verifies that each message actually originated from the source claimed in the header.
Data Streaming (DS) protocol
The synchronous block multiplexer protocol used by mainframes to access storage.
Dense Wavelength Division Multiplexing (DWDM)
A physical layer wide area transport technology that combines frequency division multiplexing techniques with time division multiplexing techniques.
Differentiated Services architecture (DiffServ)
A stateless QoS model used in IP networks as defined in IETF RFC 2475.
Direct Access File System (DAFS)
A file-level protocol for accessing storage across a Direct Access Transport (DAT).
Direct Access Transport (DAT)
A class of interconnect technologies based on Remote direct memory access (RDMA).
Direct Attached Storage (DAS)
Disk or tape storage that is directly attached to a single host. It is typically attached via SPI, SAS, PATA, or SATA.
Direct-Coupled Interlock (DCI) protocol
The asynchronous block multiplexer protocol used by mainframes to access storage.
disk control unit
A device class within a mainframe storage channel architecture used to control physical storage devices.
disk drive
A generic term referring to a floppy drive or a hard drive.
distance vector protocol
A category of routing protocols characterized by the exchange of routing table entries between topologically adjacent routers.
droop
The resulting lag in throughput that results from link buffer exhaustion. Droop occurs when the round-trip time of a link is greater than the time required to transmit sufficient data to fill the receiver's link-level buffers.
Dynamic Multi-Pathing (DMP)
A generic term describing the ability of end nodes to load balance across multiple iSCSI or FCP sessions.
Dynamic Packet Transport (DPT)
An RPR implementation developed by Cisco Systems and used, in part, as the basis for IEEE 802.17.
